LED extended optic tir light cover with light beam control

Abstract

An optic for producing an asymmetrical beam of light for restricting light output to an area below a midplane of the optic, and for directing light to the sides or down from the midplane.

What is claimed is: 
     
       1. A light producing assembly for producing a controlled spread of light, comprising:
 an LED light source; 
 an LED light cover; 
 a TIR optic of solid transparent material mounted adjacent to said LED light source; 
 a rear portion of said TIR optic comprising a generally conical cone of solid transparent material, with an apex at a first end, a circumvolving lower sidewall, with an LED pocket defined in said apex of said TIR optic, said rear portion comprising a midplane which passes through said LED pocket, with said LED pocket configured to surround an LED light source; 
 a forward portion contiguous with said rear portion of said TIR optic comprising one or more light redirecting surfaces for redirecting light paths from said LED light source to limit light from said light assembly to light below said midplane of said TIR optic; wherein 
 a forward portion upper surface angled to direct light via total internal reflectance from said light source so a minimal amount of light exits said forward portion upper surface and a maximal amount of light exits said light assembly below said midplane, for illuminating an area of roadway ahead and to the side, while limiting the light directed above said midplane of said TIR optic. 
 
     
     
       2. The light producing assembly of  claim 1  in which said rear portion ends at a generally flat face at an end opposite said apex and below said midplane, with said forward portion attached to said rear portion and extending away from said apex above said midplane. 
     
     
       3. The light producing assembly of  claim 1  in which said forward portion comprises a generally ¼ oval shape in cross section. 
     
     
       4. The light producing assembly of  claim 1  in which said forward portion is angled toward said midplane and away from said apex. 
     
     
       5. The light producing assembly of  claim 2  in which an upper surface of said forward portion of said TIR optic further comprises a plurality of angled ledges, with said angled ledges configured to reflect light by TIR in a downward or sideways direction from said midplane. 
     
     
       6. The light producing assembly of  claim 1  in which said TIR optic is comprised of PMMA acrylic. 
     
     
       7. The light producing assembly of  claim 2  in which an upper surface of said forward portion of said TIR optic further comprises a plurality of sloped facets, with said sloped facets configured to reflect light by TIR in a downward or sideways direction from said midplane. 
     
     
       8. The light assembly for producing a controlled spread of light of  claim 1  in which said rear portion ends at a generally flat face at an end opposite said apex, with said forward portion attached to said flat face of said rear portion and extending away from said apex to a front portion flat face, with said forward portion comprising one or more slot-like air spaces, with said air space walls comprising reflective surfaces for directing light via TIR from said LED light source to the sides of said light assembly. 
     
     
       9. A light producing assembly for producing a controlled spread of light, comprising:
 an LED light source; 
 an LED light cover; 
 a TIR optic of solid transparent material mounted adjacent to said LED light source; 
 a rear portion of said TIR optic comprising a generally conical cone of solid transparent material, with an apex at a first end, a circumvolving lower sidewall, with an LED pocket defined in said apex of said TIR optic, said rear portion comprising a midplane which passes through said LED pocket, with said LED pocket configured to surround an LED light source, with said rear portion ending at a generally flat face at an end opposite said apex and below said midplane; 
 a forward portion contiguous with said rear portion of said TIR optic comprising one or more light redirecting surfaces for redirecting light paths from said LED light source to limit light from said light assembly to light below said midplane of said TIR optic, with said forward portion attached to said rear portion and extending away from said apex above said midplane; wherein 
 a forward portion upper surface angled to direct light via total internal reflectance from said light source so a minimal amount of light exits said forward portion upper surface and a maximal amount of light exits said light assembly below said midplane, for illuminating an area of roadway ahead and to the side, while limiting the light directed above said midplane of said TIR optic. 
 
     
     
       10. A light producing assembly for asymmetrical light beam production comprising:
 an LED light source; 
 an LED light cover; 
 a TIR optic of solid transparent material mounted adjacent to said LED light source; 
 a rear portion of said TIR optic comprising a cone of solid transparent material, with an apex, a circumvolving sidewall and a generally cylindrical LED pocket defined in said apex of said upper and lower halves of said TIR optic conical first portion, with said LED pocket configured to surround and cover said LED light cover; 
 a front portion of said TIR optic comprising in side view a rounded top portion, a sloping face portion, a front bottom portion comprised of a number of reflective angled ridges for directing light from above to a forward trajectory, and a sloping rear portion joining the lower part of said rear conical portion, said TIR option made of solid transparent material, with said front portion seamlessly contiguous with said rear portion; wherein 
 said rounded top portion is curved to direct light downward via total internal reflectance from said light source so a minimal amount of light exits said rounded top portion, with light reflected from said rounded top portion striking said front bottom portion and being reflected by TIR in a forward direction, for illuminating an area of roadway ahead and to the side, while limiting the light directed above a midplane of said TIR optic. 
 
     
     
       11. The light producing assembly of  claim 10  in which said TIR optic is comprised of PMMA acrylic material. 
     
     
       12. The light producing assembly of  claim 10 , in which said sloping face portion is at an angle of greater than approximately 42 degrees to light beams directly from said light source, so that light beams directly from the light source pass through the sloping face portion. 
     
     
       13. The light producing assembly of  claim 10 , in which said sloping rear portion is at an angle of less than approximately 42 degrees to light beams directly from said light source, so that light beams directly from the light source do not pass through the sloping rear portion, but are reflected by TIR to a forward direction.